Abstract
AbstractIn an earlier paper it was proposed describing superconductivity in the framework of a nonadiabatic Heisenberg model in order to interprete the outstanding symmetry properties of the (spin‐dependent) Wannier functions in the conduction bands of superconductors. This new group‐theoretical model suggests that Cooper pair formation can only be mediated by boson excitations carrying crystal‐spin‐angular momentum. While in the three‐dimensionally isotropic lattices of the standard superconductors phonons are able to transport crystal‐spin‐angular momentum, this is not true for phonons propagating through the one‐ or two‐dimensional CuO sublattices of the high‐Tc compounds. Therefore, if such an anisotropic material is superconducting, it is necessarily higher‐energetic excitations (of well‐defined symmetry) which mediate pair formation. This fact is proposed being responsible for the high transition temperatures of these compounds.
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